Page 9 - Woodbank-Matariki ebook

Sires with low, or negative, fat EBVs are expected to produce
leaner progeny at any particular carcase weight than will
sires with higher EBVs.
Retail Beef Yield EBV (%) indicates genetic differences
between animals for retail yield percentage in a standard 400
kg carcase. Sires with larger EBVs are expected to produce
progeny with higher yielding carcases.
Intramuscular Fat EBV (%) is an estimate of the genetic
difference in the percentage of intramuscular fat at the
12/13th rib site in a 400 kg carcase. Depending on market
targets, larger more positive values are generally more
favourable.
Docility EBV (%) is an estimate of the genetic differences
between animals in temperament. Docility EBVs are
expressed as differences in the percentage of progeny that
will be scored with acceptable temperament (ie. either
“docile” or “restless”).

Accuracy

Accuracy (%) is based on the amount of performance
information available on the animal and its close relatives
- particularly the number of progeny analysed. Accuracy
is also based on the heritability of the trait and the genetic
correlations with other recorded traits. Hence accuracy
indicates the “confidence level” of the EBV. The higher
the accuracy value the lower the likelihood of change in
the animal’s EBV as more information is analysed for
that animal or its relatives. Even though an EBV with a
low accuracy may change in the future, it is still the best
estimate of an animal’s genetic merit for that trait. As more
information becomes available, an EBV is just as likely to
increase in value, as it is to decrease.
Accuracy values range from 0-99%.
As a rule, animals should be compared on EBVs regardless
of accuracy. However, where two animals have similar EBVs
the one with higher accuracy could be the safer choice,
assuming other factors are equal.
For further information please contact NZ Angus or TACE.

Woodbank Angus & Matariki Herefords Bull Sale 2021 7